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I'm following the step-by-step instruction: http://wiki.ros.org/ROSberryPi/Setting%20up%20Hydro%20on%20RaspberryPi


$ rosinstall_generator ros_comm --rosdistro hydro --deps --wet-only > hydro-ros_comm-wet.rosinstall

returns error:

 File "/home/pi/.local/lib/python2.7/site-packages/yaml/constructor.py", line 452, in construct_undefined
yaml.constructor.ConstructorError: could not determine a constructor for the tag 'tag:yaml.org,2002:python/str'
  in "<string>", line 5773, column 28:
        </package>\n", ar_sys: !!python/str "<?xml version=\"1. ..

Anyone has an idea how to fix that?

Thanks Rabiato

Originally posted by Rabiato on ROS Answers with karma: 16 on 2020-12-20

Post score: 0

Original comments

Comment by gvdhoorn on 2020-12-21:
Do you have a specific reason to want to install ROS Hydro? It's been EOL for quite some time now.


1 Answer 1


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I'm a beginner and want to work with the book "Learning ROS for Robotics Programming" which uses Hydro. However, I gave it a thought and guess it should work with later versions too. I'm currently installing Melodic w/ instruction and it looks like it is working:


Thanks, I guess I close the question since it's a wast to go back in time.

Originally posted by Rabiato with karma: 16 on 2020-12-21

This answer was ACCEPTED on the original site

Post score: 0


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